[Tutor] python string __add__

[Bob Gailer]

At 11:00 AM 6/5/2003 -0700, tpc@csua.berkeley.edu wrote:


>I have a script that will take decimal numbers of any length as command
>line arguments and output the binary equivalent.  However, I am trying to
>output one long string with no spaces.  I attempted __add__ but got empty
>spaces.  Is there a way for python string __add__ to output binary digits
>with no spaces ?
>
><code>
>#!/usr/bin/env python
>""" a program that takes decimal numbers of any length as space-delimited
>command line arguments and outputs binary numbers separated by newline"""
>
>import sys
>
>dict = {
>            '0' : '0000',
>            '1' : '0001',
>            '2' : '0010',
>            '3' : '0011',
>            '4' : '0100',
>            '5' : '0101',
>            '6' : '0110',
>            '7' : '0111',
>            '8' : '1000',
>            '9' : '1001'
>        }
>#x = ''
>length = len(sys.argv[1:])
>while length > 0:
>     for i in range(length):
>         w = sys.argv[-length]
>         length = length - 1
>         list1 = list(w)
>         list1.reverse()
>         length2 = len(list1)
>         while length2 > 0:
>             for i in range(length2):
>                 w = list1[length2 - 1]
>                 length2 = length2 - 1
>#                x.__add__(dict[w])
>                 x = dict[w]
>                 print x,
>             print '\n'
>
></code>

This program generates Binary Coded Decimal, not Binary. Getting spaces is 
an effect of the print statement.

following
                 length2 = length2 - 1:
try this:
                 x += dict[w]
             print x

FWIW this program is much more complex than needed. You can reduce it to:

dict = {
...
}
for number in sys.argv[1:]: print ''.join([dict[digit] for digit in number])

Bob Gailer
Specialist in evaluating training outcomes.
bgailer@alum.rpi.edu
303 442 2625